CN108594344B - Slit grating design method for weakening moire in LED naked eye 3D display - Google Patents

Slit grating design method for weakening moire in LED naked eye 3D display Download PDF

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CN108594344B
CN108594344B CN201810410095.2A CN201810410095A CN108594344B CN 108594344 B CN108594344 B CN 108594344B CN 201810410095 A CN201810410095 A CN 201810410095A CN 108594344 B CN108594344 B CN 108594344B
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slit grating
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王琼华
胡建青
赵悟翔
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Sichuan University
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Abstract

The invention discloses a slit grating design method for weakening moire fringes in LED naked eye 3D display. The slit grating design method comprises the following three specific steps: the method comprises the steps of firstly, measuring the respective widths of a pixel light-emitting part and a pixel non-light-emitting part of an LED screen and calculating the parameters of a conventional vertical slit grating; secondly, determining parameters of a light transmitting strip and a light blocking strip in a first period of the slit grating according to the pixel spacing of the LED screen and the width of a non-luminous part of the pixel; and thirdly, setting parameters of the light transmission strips and the light blocking strips in the second period of the slit grating, and repeating the two period structures until the widths of the slit grating and the LED screen formed by the two period structures are the same. According to the characteristic that the non-luminous part of the LED screen pixel is wide, the design method of the slit grating increases the difference between the periodic structure of the slit grating and the pixel periodic structure of the LED screen by properly increasing the width of the light transmission strip of the slit grating and changing the geometric shape of the light transmission strip, so that not only can Moire be weakened, but also the crosstalk of a three-dimensional image cannot be increased.

Description

Slit grating design method for weakening moire in LED naked eye 3D display
One, the technical field
The invention relates to the technical field of naked eye 3D (three-dimensional) display, in particular to a slit grating design method for weakening moire in LED naked eye 3D display.
Second, background Art
When a slit grating naked eye 3D display is watched, a viewer can watch a stereoscopic image without wearing any vision-aid equipment. With the maturity of slit grating naked eye 3D display technology in recent years, slit grating naked eye 3D display products with large size, high brightness, vivid color and no moire are gradually the targets pursued by people. The LED screen is suitable for large-screen display due to the characteristics of large size, high brightness, bright color and the like. However, for the conventional vertical slit grating, which arranges the light-transmitting strips in parallel with the column pixels of the display screen, when the eyes see the non-light-emitting part between the adjacent sub-pixels through the light-transmitting strips, the eye generally sees a stripe with a periodic light and dark gradual change, i.e. a moire pattern, which seriously affects the viewing effect.
Third, the invention
The invention discloses a slit grating design method for weakening moire fringes in LED naked eye 3D display. The slit grating design method is characterized in that according to the characteristic that non-luminous parts among pixels of the LED screen are wide, the difference between the periodic structure of the slit grating and the pixel periodic structure of the LED screen is increased by properly increasing the width of a light transmission strip of the slit grating and changing the geometric shape of the light transmission strip, and therefore Moire patterns are weakened.
The slit grating design method comprises the following three specific steps:
first step ofAnd measuring the widths of the pixel luminous part and the pixel non-luminous part of the LED screen and calculating the parameters of the conventional vertical slit grating. FIG. 1 is a structural schematic diagram of a slit grating LED naked eye 3D display and a pixel structure diagram of an LED screen; fig. 2 is a schematic diagram of the light splitting principle and parameters of a slit grating LED naked-eye 3D display. Let the pixel pitch of the LED screen in the attached figures 1 and 2 be p, the distance from the slit grating to the LED screen be D, and the width of the light-transmitting strip of the slit grating be WwThe width of the light-blocking strip is WbThe period of the slit grating is T ═ Wb+WwThe distance from the optimal viewing position to the LED screen is S, the distance between adjacent viewpoints is set as e according to the average interpupillary distance of human eyes, the number of viewpoints is set as K, and K is a natural number which is more than or equal to 2. The relationship between the parameters is:
Figure BDA0001647809330000011
Figure BDA0001647809330000012
Figure BDA0001647809330000013
wherein p, S, e and K are known parameters, and the parameters of the LED naked eye 3D display adopting the conventional vertical slit grating can be obtained according to the formulas (1) to (3): D. ww、Wb、T。
The pixels of the LED screens in fig. 1 and 2 are square, and the side length is the same as the pixel pitch, and is p. The light emitting portion of each pixel of the LED panel is approximately circular, and the other portion is a non-light emitting portion, and for a single pixel of the LED panel, let the width of the light emitting portion be d, and the half width of the non-light emitting portion be c, the relationship between them be:
Figure BDA0001647809330000021
secondly, determining a slit according to the pixel interval of the LED screen and the width of a non-luminous part of the pixelThe parameters of the light transmission strip and the light blocking strip in the first period of the grating. In the first period of the slit grating, the shape of the light-transmitting strip is isosceles trapezoid, and the width of the light-transmitting strip is divided into the width W of the upper bottom edgew1And a width W of the bottom edgew2And the maximum value is WwmaxMinimum value of WwminThe relations are respectively as follows:
Figure BDA0001647809330000022
Figure BDA0001647809330000023
Ww1and Ww2All should be between WwmaxAnd WwminAnd W isw1And Ww2Not equal, i.e. the relation between them is:
Wwmax≥Ww1≥Wwmin(7)
Wwmax≥Ww2≥Wwmin(8)
Ww1≠Ww2(9)
the period T is kept unchanged, and the width of the upper bottom edge of the light blocking strip is Wb1The width of the lower bottom edge is Wb2，Wb1Following Ww1Is changed by a change of Wb2Following Ww2I.e. the relation between them is:
Ww1+2Wb1-Wb2＝Ww2+Wb2＝T (10)
and thirdly, setting parameters of the light transmission strips and the light blocking strips in the second period of the slit grating, and repeating the two period structures until the widths of the slit grating and the LED screen formed by the two period structures are the same. Fig. 3 is a schematic diagram showing a periodic structure of a vertical slit grating of a trapezoidal light transmission strip. Setting the adjacent period at right or left of the first period as the second period of the slit grating, wherein the width of the upper bottom edge of the light transmission strip is Ww3＝Ww2The width of the lower bottom edge is Ww4＝Ww1The width of the upper bottom edge of the light blocking strip is Wb3＝Wb2The width of the lower bottom edge is Wb4＝Wb1. And then, repeating the periodic structures of the two adjacent periods in sequence from left to right or from right to left until the slit grating formed by the periodic structures is the same as the width of the LED screen.
According to the invention, the moire is weakened by increasing the difference between the periodic structure of the slit grating and the pixel periodic structure of the LED screen, and the crosstalk of a three-dimensional image is not increased.
Description of the drawings
FIG. 1 shows a structural schematic diagram of a slit grating LED naked-eye 3D display and a pixel structure diagram of an LED screen.
FIG. 2 is a schematic diagram of a light splitting principle and parameters of a slit grating LED naked-eye 3D display.
FIG. 3 is a schematic diagram of a periodic structure of a vertical slit grating of a trapezoidal light-transmitting strip.
The reference numbers in the figures are:
1LED screen, 2 slit grating, 3 viewpoints, 4LED screen pixel luminescence parts, 5LED screen pixel non-luminescence parts, 6 light transmission bars, and 7 light blocking bars.
It should be understood that the above-described figures are merely schematic and are not drawn to scale.
Fifth, detailed description of the invention
The following describes in detail an embodiment of a slit grating design method for weakening moire in LED naked eye 3D display, which is proposed by the present invention, and further describes the present invention in detail. It should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and those skilled in the art can make modifications and adaptations of the present invention without departing from the scope of the present invention.
The embodiment is an application example of a slit grating design method for weakening moire in an LED naked eye 3D display with a viewing point number K being 5, the size of the LED screen is 640mm × 320mm, the average interpupillary distance of human eyes is about 65mm, so the distance e between adjacent viewing points is 65mm, and the distance S between the optimal viewing position and the LED screen is 4 m.
The present example was carried out as follows:
in the first step, the respective widths of the pixel light-emitting portion and the pixel non-light-emitting portion of the LED panel are measured and the parameters of a conventional vertical slit grating are calculated. The selected LED screen in the embodiment is formed by splicing four small LED screens, and the following parameters can be obtained from data provided by an LED screen manufacturer: the pixel pitch p of the LED panel is 2.50mm, and the light emitting portion width d is 1.50 mm. According to the formula
Figure BDA0001647809330000031
Figure BDA0001647809330000032
Figure BDA0001647809330000033
The following parameters can be obtained: the distance D between the slit grating and the LED screen is 148.15mm, the period T of the slit grating is 12.04mm, and the width W of the light transmission strip of the slit gratingw2.41mm, width W of light-blocking stripb9.63 mm. According to the formula
Figure BDA0001647809330000034
The half width c of the non-light emitting portion can be obtained to be 0.50 mm.
And secondly, determining parameters of a light transmitting strip and a light blocking strip in the first period of the slit grating according to the pixel pitch and the width of a non-luminous part of the pixel of the LED screen. According to the formula
Figure BDA0001647809330000041
Figure BDA0001647809330000042
The following parameters can be obtained for the first period: maximum width of light-transmitting stripWwmax3.37mm, minimum width of light transmitting strip Wwmin2.41 mm. According to the formula
Wwmax≥Ww1≥Wwmin(7)
Wwmax≥Ww2≥Wwmin(8)
Ww1≠Ww2(9)
The width W of the upper and lower edges of the light-transmitting strip used in the first period of the slit grating of this embodimentw12.46mm, width of lower base Ww23.30 mm. According to the formula
Ww1+2Wb1-Wb2＝Ww2+Wb2＝T (10)
The width W of the upper bottom edge of the light blocking strip can be obtainedb19.16mm, width of bottom edge Wb2＝8.74mm，Wb1-Wb2＝0.42mm。
And thirdly, setting parameters of the light transmission strips and the light blocking strips in the second period of the slit grating, and repeating the two period structures until the widths of the slit grating and the LED screen formed by the two period structures are the same. First, the adjacent period to the right of the first period is set as the second period of the slit grating. And then, vertically mirroring the light transmission strips and the light blocking strips in the first period, and setting the light transmission strips and the light blocking strips in the second period. The width W of the upper bottom edge of the light-transmitting strip of the second period can be obtainedw3＝Ww23.30mm, width of bottom edge Ww4＝Ww12.46mm, width W of upper and lower edges of the light-blocking stripb3＝Wb28.74mm, width of lower base Wb4＝Wb19.16 mm. And finally, repeating the vertical slit grating periodic structures of the trapezoidal light transmission strips with the two adjacent periods in sequence from left to right until the slit gratings formed by the two adjacent periods have the same width as the LED screen. Thus, the design process of the slit grating of the present embodiment is completed.

Claims (1)

  1. A slit grating design method for weakening moire in LED naked eye 3D display is characterized in that according to the characteristic that non-luminous parts among pixels of an LED screen are wide, proper adjustment is carried outThe method for increasing the width of the light transmission strip of the slit grating and changing the geometric shape of the light transmission strip to increase the difference between the periodic structure of the slit grating and the pixel periodic structure of the LED screen comprises the following three steps: the method comprises the following steps of firstly, measuring the respective widths of a pixel luminous part and a pixel non-luminous part of the LED screen and calculating the parameters of the conventional vertical slit grating, wherein the specific design process comprises the following steps: let the pixel pitch of the LED screen be p, the distance from the slit grating to the LED screen be D, and the width of the light transmission strip of the slit grating be WwThe width of the light-blocking strip is WbThe period is T ═ Wb+WwThe distance from the optimal viewing position to the LED screen is S, the distance between adjacent viewpoints is set as e according to the average interpupillary distance of human eyes, the number of viewpoints is set as K, and K is a natural number which is more than or equal to 2; the relationship between the parameters is:
    Figure FDA0002462991760000011
    from these three equations, important parameters in conventional vertical slit grating design are derived: D. ww、WbT; the pixels of the LED screen are square, the side length of each pixel is the same as the pixel interval, and the side length of each pixel is p; the light emitting portion of each pixel of the LED panel is approximately circular, and the other portion is a non-light emitting portion, and for a single pixel of the LED panel, let the width of the light emitting portion be d, and the half width of the non-light emitting portion be c, the relationship between them be:
    Figure FDA0002462991760000012
    secondly, determining parameters of a light transmitting strip and a light blocking strip in a first period of the slit grating according to the pixel interval of the LED screen and the width of a non-luminous part of the pixel, wherein the specific design process is as follows: in the first period of the slit grating, the shape of the light-transmitting strip is isosceles trapezoid, and the width of the light-transmitting strip is divided into the width W of the upper bottom edgew1And a width W of the bottom edgew2And the maximum value is WwmaxMinimum value of WwminThe relations are respectively as follows:
    Figure FDA0002462991760000013
    Ww1and Ww2All should be between WwmaxAnd WwminIn the above-mentioned manner,and Ww1And Ww2Not equal, i.e. the relation between them is: wwmax≥Ww1≥Wwmin，Wwmax≥Ww2≥Wwmin，Ww1≠Ww2(ii) a The period T is kept unchanged, and the width of the upper bottom edge of the light blocking strip is Wb1The width of the lower bottom edge is Wb2，Wb1Following Ww1Is changed by a change of Wb2Following Ww2I.e. the relation between them is: ww1+2Wb1-Wb2＝Ww2+Wb2T; thirdly, setting parameters of a light transmitting strip and a light blocking strip in a second period of the slit grating, and repeating the two period structures until the widths of the slit grating and the LED screen formed by the two period structures are the same, wherein the specific design process comprises the following steps: setting the adjacent period at right or left of the first period as the second period of the slit grating, wherein the width of the upper bottom edge of the light transmission strip is Ww3＝Ww2The width of the lower bottom edge is Ww4＝Ww1The width of the upper bottom edge of the light blocking strip is Wb3＝Wb2The width of the lower bottom edge is Wb4＝Wb1(ii) a And then, repeating the periodic structures of the two adjacent periods in sequence from left to right or from right to left until the slit grating formed by the periodic structures is the same as the width of the LED screen.
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